Analogue holographic wavefront sensor: a performance analysis

Zepp, Andreas; Gładysz, Szymon; Barros, Rui; Stein, Karin

doi:10.1117/12.2187933

Cited by 2 publications

(3 citation statements)

References 7 publications

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“…To create a multimode device, multiplexing the single aberration holograms into one multiplexed sensor is required. 1 This device can analyze an incoming wavefront containing a multitude of Zernike modes in terms of the recorded modes by distributing the intensity into the corresponding spot pairs. Collecting the response curves to each aberration mode of the sensor yields the sensitivity matrix which can be used to reconstruct the wavefront based on the included Zernike modes.…”

Section: Modal Holographic Wavefront Measurementmentioning

confidence: 99%

“…For optical communication via free space links atmospheric turbulence is the main bottleneck for effective data transfers. 1 To compensate the turbulence effects on the receiver side an adaptive optics setup with a sufficiently high rejection frequency is needed. 2 This frequency is determined by the latencies of the loop components which include the deformable mirror settling time, the wavefront reconstruction, and the wavefront sensor readout time.…”

Section: Introductionmentioning

confidence: 99%

“…2 Alternatively, the use of holographic wavefront sensors has been widely discussed. 1 The goal is to deconstruct the wavefront directly into modal components. 3 The required measurements can be done in a single shot and through intensity measurements.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Mitigation of inter-modal crosstalk in the holographic wavefront sensor through the implementation of a multi plane light conversion

Krause,

Berlich,

Vetter

et al. 2023

Environmental Effects on Light Propagation and Adaptive Systems VI

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Free space optical communication (FSOC) represents a promising technology to enable a secure transmission with high data rates over long distances. Ensuring proper operation in turbulent atmospheric conditions by adaptive optics (AO) is essential for the general feasibility of FSOC. A bottle neck of the AO performance is the limited speed of control loops based on Shack-Hartmann wavefront measurements. Alternatively, holographic wavefront sensors provide the potential for an increased measurement speed by enabling a direct measurement of individual spatial mode amplitudes of the turbulence. So far, their performance is limited by inter-modal crosstalk. In this work, a design algorithm to build a holographic sensor out of a sequence of holographic plates is developed. To this end, an adapted wavefront-matching mode sorter algorithm is implemented, which is based on the use of Zernike-polynomials. The algorithm allows for designing multiple holographic phase plates in sequence with a built-in optimization of crosstalk reduction. The phase profile of the received beam is converted through interaction with each phase plate before the beam hits a detection plane. The designed computer-generated-holograms are characterized by simulation and the mitigation of crosstalk is shown for a higher number of holographic phase plates. Additionally, a proof-of-concept experiment is performed to demonstrate the desired behavior of the holographic sensor.

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Section: Modal Holographic Wavefront Measurementmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Mitigation of inter-modal crosstalk in the holographic wavefront sensor through the implementation of a multi plane light conversion

Krause,

Berlich,

Vetter

et al. 2023

Environmental Effects on Light Propagation and Adaptive Systems VI

View full text Add to dashboard Cite

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Comparing thin and volume regimes of analog holograms for wavefront sensing

Branigan,

Zepp,

Martin

et al. 2024

Opt. Express

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Two analog holographic wavefront sensors, for measurement of defocus, have been fabricated as both thin and volume phase transmission holograms in a self-developing photopolymer. This represents the first reported direct comparison of hologram regimes when designed for wavefront sensing. An analysis of the effect of crosstalk in the presence of one other aberration mode (astigmatism X (0/90°), coma X (horizontal), and primary spherical aberration) was carried out with each version of the sensor. The performance of thin and volume analog holographic wavefront sensors was characterized under emulated conditions associated with moderate atmospheric turbulence.

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Analogue holographic wavefront sensor: a performance analysis

Cited by 2 publications

References 7 publications

Mitigation of inter-modal crosstalk in the holographic wavefront sensor through the implementation of a multi plane light conversion

Mitigation of inter-modal crosstalk in the holographic wavefront sensor through the implementation of a multi plane light conversion

Comparing thin and volume regimes of analog holograms for wavefront sensing

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